Lamdba Expression, Use Assignment Operator Instead Of Equality?
Oct 27, 2010
I have a method that takes an System.Action, this is what I'm trying to feed it:Function() Me._existingImports = Me.GetImportedAds()
The thing is that it complains about the = sign since it thinks I'm trying to do a comparison, which I'm not. I want to assign the Me._existingImports the value of Me.GetImportedAds(), but VB.NET complains about DataTable not having a = operator.
How can I force it to use the assignment operator instead of the equality operator?
In C# this works perfectly fine: () => this.existingImports = this.GetImportedAds()
For now the solution will be to use a standalone method, but that's way more code than needed.
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Jan 28, 2011
So I'm writing the equality operator overload (Operator =())for a custom object, and the resulting mess of If conditionals is just an eyesore. But so far, it seems like the only sane way to check the values to as to match the specific behavior of this object.
The rules are:Num1 is required, period, and both the left and right operands and must be equal for True. Else, False.Num2 is optional, but if specified, must be present for both the left and right operands, and must be equal for True. Else, False.Num3 is optional, but can only be specified if Num2 is also present. Else, False.Num3, if specified, must be present for both the left and right operands, and must be equal for True. Else, False.
[Code]..
I also know that I could cache elements of the checks into booleans and then use those to reduce the amount of text. But that seems like a waste of cycles just for code readability. So I wanted to know if the SO community had better thoughts on reorganizing it, just in case I'm being too verbose with my checks.
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Jan 9, 2010
i would like to hijack the assignment operator and do some customization before an instance of my class is assigned.
example:
Dim A as New MyClass
Dim B as MyClass = A
i want custom the behavior of = is that possible?
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Jul 9, 2010
I am having a structure that is actually a simple byte with more functionality.[code]...
If there would be a way to inherit from Structure I would simply inherit from Byte adding my functionality, basically I just need a byte Structure with custom functionality.
My question is also valid when you want to define your new singleton member value-types (like, you want to define a nibble-type for instance etc.) and you want to be able to set it with an assignment to number or other language typed representation.
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Dec 16, 2010
My program has decided to assign pointers instead of make copies of an object, and I'm not sure why. I have something like this:
Public Class Foo
Private myFooData As New List(Of FooData)
Public Sub New(ByVal newFooData As List(Of FooData))
[Code]....
Very simplified, but basically what I'm doing. So for some reason today when I change item in newFoo.FooValues, originalFoo.FooValues also changes, and mainFoo does not. I've tried assigning the entire objects as well and I get the same results.
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Oct 20, 2009
I am using VB.Net 2008 Express.I am trying to move a button on a form, the button status is unlocked. The code that I want to use is:
Me.btnEnter.Location.Y = 474
However, I get the error message, "Expression is a value and therefore cannot be the target of an assignment" If I now code as follows, I get the error message, "Property access must assign to the property or use its value"
Me.btnEnter.Location.Y
The errors appear contradictory. Just to check, I wrote the following
X = Me.btnEnter.Location.Y
And when run I received the correct answer of 535.What is happening? What am I missing?
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Oct 25, 2010
I have a list of items and wish to set one of their properties to a certain value:
applist.ForEach(Function(x) x.PrePaidTypeID = CInt(DBEnums.PrePaidType.NoPrepay))
...but we think this just does a boolean comparison. Is there a way to force VB to assign the integer value rather than compare it?
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Jul 20, 2009
When I have the following code, I get an "Expression is a value and therefore cannot be the target of an assignment." error as shown:
Public Class Form1
'Test Project
Public Structure Blah
Public ID As String
[code].....
But when I change the structure to a class, this works fine:
Public Class Form1
'Test Project
Public Class Blah
Public ID As String
[code].....
What connection am I missing between the two? I don't understand why the first example doesn't work, but the second does. Everything I know says they should both work just fine.
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Jan 12, 2011
Public Sub MoveMouseCursor(ByVal NewMousePoint As Point)
Cursor.Position.X = NewMousePoint
End Sub
Expression is a value and therefore cannot be the target of an assignment.
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Nov 18, 2009
I'm "cloning" objects in my code. For instance: objClone = objOriginal My question is: Does the assignment operator in VB.NET 1.1 do a member-by-member copy of the objOriginal to objClone or does objClone simply point as a reference to memory referenced by objOriginal?
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Feb 26, 2010
Lambda expression with ternary operator in VB?
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Dec 9, 2011
I'm receiving the following error from the query below:
Syntax error (missing operator) in query expression 'LTC_FBS.DBS_NM = LTC_FBS_EMP.EMP_ID
INNER JOIN LTC_FBS_REV on LTC_FBS.FBS_REV = LTC_FBS_REV.REV_I'.
Dim sSQL As String = "SELECT FBS_ID, CLM_NUM, EMP_NM, REV_NM, DATE_SUBMIT FROM
[code].....
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Jul 1, 2012
"SELECT od.OrderID, SUM(CONVERT(money, (od.UnitPrice * " &_
" od.Quantity) * (1 - od.Discount) / 100) * 100) " &_
" AS Total, o.EmployeeID, o.OrderDate, " &_
[code].....
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Jul 6, 2009
I have been working at this for awhile, searching everywhee, I keep getting the error: Syntax error (missing operator) in query expression 'UPC Code=051384628502'.The block of code this error originates from is: [code] When I make it into a comment, the program works, except it doesn't put the string value I want into the table, nor does it save it.
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Sep 21, 2011
Function updateCoustmers(ByVal ID As String, ByVal codeq As String, ByVal nameq As String, ByVal birthdateq As String, ByVal addressq As String, ByVal mobilenumberq As String, ByVal phonenumberq As String, ByVal certificateq As String, ByVal dateofregisterq As String, ByVal nameofcourseq As String, ByVal priceofcourseq As String, ByVal
[code]....
this is wrong message shown to me ( Syntax error (missing operator) in query expression '[ID]='. )
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Mar 11, 2009
i have to complete a room reservation projecti have a database called project21.mdb and there is 3 table inside rooms,users,and bookingsnow i facing a problems on display my filter data on the datagridview1 ,it appear syntax error(missing operator).this is my code ..i think the problems is appear in this line,but i just cant find the problemsDim cmd As OleDbCommand = New OleDbCommand("SELECT
type,startdate,enddate,starttime,endtime FROM rooms,bookings WHERE[code]......
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May 6, 2010
i am getting error while inserting record in ms access here is my sample code
Dim str As String
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:final.mdb;")
cn.Open()
str = "INSERT INTO 019loan (Salutationinteger,Customername,shortname,
[code]....
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May 5, 2010
I am using vb.net 2003 and accessing an Access 2002 database via oleDb and Jet 4.0.I am filling a set of text boxes with data from the database. The Connection, DataAdapter and DataSet are all set using the Wizard. The text boxes fill correctly with the first row of data. I then wished to filter the data so I went into the code and added a WHERE clause as follows:WHERE [Boat Name]=" & xid & "xid is the variable name given to the selected boat name. When I run the program I get the following error message:
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Apr 27, 2012
I'm trying to populate a combobox from another combobox
There are two comboboxes involve:
1. comboSupplierID
2. comboSProducts
[code].....
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Jul 22, 2011
i m having the following code please help me to find out where is error as i am new to vb.net...
device = ComboBox1.SelectedItem having a combobox which will choose any device from CPU , Monitor or Printer Private Sub show_details()Dim deviceNO As String ds.Clear()da.SelectCommand = Nothing deviceNO = ComboBox2.SelectedItem 'id of the device deviceNO.Trim()
[Code]...
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Apr 11, 2009
I have program, which takes scripts (RGSS) and inserts them into a database. These scripts have lots of quotes and things like that inside them, but I don't think thats the issue here.
The error: Syntax error (missing operator) in query expression
[Code]....
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Dec 22, 2009
E.g. how do I get VB.Net to statically type a local variable to be the static type of the expression on the right had side of the assignment?
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Sep 21, 2011
Private Sub btnSearch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSearch.Click
[Code]...
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Jun 4, 2012
Dim cellidentification = ComboBox1.SelectedItem
Dim SCR = ComboBox2.SelectedItem
Dim mySelectQuery1 As String = "SELECT [" +
[code].....
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Mar 14, 2010
If BallOvalShape.FillColor = Ball24.FillColor Then
BallOvalShape.Location.X = 323
BallOvalShape.Location.Y = 536
Ball24.Visible = False
End If
The part i'm getting an error on is
BallOvalShape.Location.X = 323
BallOvalShape.Location.Y = 536
This seems like it should be easy, and should work but I get the error: "Expression is a value and therefore cannot be the target of an assignment" I am placing this within the timmer, I just want to move the object back to it's starting point, is there a better way to do this, or why it's not working?
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Dec 26, 2011
Syntax error (missing operator) in query expression 'Serial Number = 'L3FW341''.The Serial Number field is declared as text in Access Db.
I am not sure which operator is missing in my command!Below is my code:[code]......
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Jan 30, 2010
how to create a lamdba expression instead of using a regular comprehension linq queries. All of the examples i see are not query a database using linq to sql. i want to able to construct a lambda expression that get my the orders from the northwind database where the country equals "us". I know how to construct this using the standard linq query, but just not using lambdas in vb.net.
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Mar 25, 2012
I'm trying to update data to a Access data base using the following [code]...
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Jul 18, 2008
This is not a homework of mine and i had never tried ms access database with vb so i just gave it a shot. so this is my first time and i am just trying not asking anyone to complete my homework. I have been searching for this a lot on internet but couldn't find a solution to this so i decided to ask this question here.
i have this sql code. what i want to do is that create a basic login form where users puts it's username in the UsernameTextbox and Password in the PasswordTextbox. If the the information match then a message box appears saying that the user is valid and if the information does not exist, a mesage box appears saying the users is not valid. now everytime i execute(run) the code, i come up with this error: Syntax error (missing operator) in query expression ''UserName' = 'Admin' 'PassWord' = 'testing123''.
The field names(UserName, PassWord) are also correct they are same as in the database. the information put in the username and password textbox are correct and they match the information on the database. But i dont know why this error comes up.
My code module is the following:
Imports System.Data.OleDb
Public Class LoginForm1
' Cancel button
Private Sub Cancel_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Cancel.Click
Me.Close()
End Sub
[CODE]...
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Mar 7, 2012
I have 2 comboboxes who are loaded on the formload event with the folloving
[Code]...
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